DPOD's Big Data Store is located on a dedicated mount point. Occasionally, the disk space allocated for the Store needs to be increased. Reasons for that include an increase in TPS, or a requirement to retain history for longer periods of time. Follow the steps below to increase the Store space.

It is possible to extend the existing data disk (option 1), or add an additional one (option 2). Choose the option below that is suitable for your environment.

Option 1: Extending the Existing Data Disk

Note: fdisk utility supports disks up to 2TB each. To increase the Store space above 2TB, add additional disks (option 2) instead of extending a single data disk.

Extending the Disk in a Physical Server

For physical servers, use the server vendor's RAID management software to extend the existing RAID Disk (LUN) in order to increase the data disk.

Extending the Disk in a Virtual Machine

Use the VMware vSphere Client in order to edit the DPOD virtual machine settings:

1. Stop the DPOD virtual machine.
2. Select Edit virtual machine settings
3. Select the 3rd hard drive (which is the data disk, as described in the Hardware and Software Requirements page).
4. Increase the Provisioned size of the hard drive and press OK.
5. Wait for the increase process to finish.
6. Start the DPOD virtual machine.
   
   

Configuring the File System after Extending the Disk

1. Verify the current size of mount point /data:

   df -h /data

   The system output should resemble the following:
   
   
   

2. Verify the new disk size:

   fdisk -l | grep /dev/sdc

   The system output should resemble the following:

   
   
   

3. Use fdisk to create a new partition for the new size:

   fdisk /dev/sdc

   1. Press p to print the partition table to identify the number of partitions:
      
      If this is the first time the disk is extended, you should only see sdc1. If this is a subsequent extension - you will see additional sdcX listed (e.g. sdc2 for the second extension).
   2. Press n to create a new primary partition.
   3. Press p for primary.
   4. When the system prompts for a partition number, enter the next number depending on the output of the partition table print.
      If this is the first extension and you see only one row of output - enter 2. If this is the second disk extension then the partition number will be 3, and so on.
   5. Press Enter twice
      
   6. Press t to change the system's partition ID.
   7. Press 2 to select the newly created partition (Remember: if this is a subsequent disk extension - the number will be 3 or higher).
   8. Type 8e to change the Hex Code of the partition for Linux LVM.

   9. Press w to write the changes to the partition table.
      
      
      
      

      The following warning is valid, the system reboot will fix the issue:
      “WARNING: Re-reading the partition table failed with error 16: Device or resource busy. The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8)”

4. Reboot the system:
   

   reboot

   
   

5. When the system is available again, ensure the new partition is available:

   fdisk -l | grep /dev/sdc

   The system output should resemble the following (note the new sdcX added):
   
   
   

6. Stop the application by running app-util.sh and selecting option 2 (stop all).
   
   

7. Create a new LVM Physical Volume (PV):

   If the new partition is not sdc2, substitute sdc2 for the right qualifier in all the following commands

    pvcreate /dev/sdc2

8. Extend the LVM Volume Group (VG):

   vgextend vg_data /dev/sdc2

9. Extend the LVM Logical Volume (LV):

   lvextend -l +100%FREE /dev/vg_data/lv_data

10. Identify the /data file system type (for CentOS 7.2+ based appliances the type is xfs):

    cat /etc/fstab | grep /data

    The system output should resemble the following:
    
    
    

11. Resize the file system. Select the correct command below for your file system type:

    For ext4

    resize2fs /dev/vg_data/lv_data

    For xfs

    xfs_growfs /dev/vg_data/lv_data

    
    The system output should resemble the following:
    
    
    

12. Display the new size of the /data mount point:

    df -h /data

13. Update the Store configuration file (see below).

Option 2: Adding an Additional Data Disk

Adding an Additional Disk in a Physical Server

For physical servers, use the server vendor's RAID management software to add new RAID Disk (new LUN), in order to increase the data disk.

Adding an Additional Disk in a Virtual Machine

Use the VMware vSphere Client in order to edit the DPOD virtual machine settings:

1. Stop the DPOD virtual machine.
2. Select Edit virtual machine settings
3. Select Add > Hard Drive
4. Ensure to configure the new hard drive as Thick Provision Eager Zeroed
5. Wait for the increase process to finish.
6. Start the DPOD virtual machine.
   

Configuring the File System after Adding the Disk

1. Verify the current size of the /data mount point:

   df -h /data

   The system output should resemble the following:
   

2. Verify the new disk size:

   fdisk -l | grep /dev/sdd

   The system output should resemble the following:
   

3. Use fdisk to create a new partition for the new size:

   fdisk /dev/sdd

   1. Press p to print the partition table and ensure there are no existing partitions. 
      
   2. Press n to create a new primary partition.
   3. Press p for primary.
   4. Press 1 for the partition number
   5. Press Enter twice
      
   6. Press t to change the system's partition ID.
   7. Type 8e to change the Hex Code of the partition for Linux LVM.
   8. Press w to write the changes to the partition table.
      
      
      

4. Reboot the system:

   reboot

5. When the system is available again, ensure the new partition is created:

   fdisk -l | grep /dev/sdd

    The system output should resemble  the following:
   

6. Stop the application by running app-util.sh and selecting option 2 (stop all)
   
   

7. Create a new LVM Physical Volume (PV):

   pvcreate /dev/sdd1

8. Extend the LVM Volume Group (VG):

   vgextend vg_data /dev/sdd1

9. Extend the LVM logical volume (LV):

   lvextend -l +100%FREE /dev/vg_data/lv_data

10. Identify the /data file system type (for CentOS 7.2+ based appliances the type is xfs): 

    cat /etc/fstab | grep /data

     The system output should resemble the following:
    
    
    

11. Resize the file system. Select the correct command below for your file system type:

    For ext4

    resize2fs /dev/vg_data/lv_data

    For xfs

    xfs_growfs /dev/vg_data/lv_data

    
    The system output should resemble the following:
    
    
    

12. Display the new size of the /data mount point:

    df -h /data

    The system output should resemble the following:
    
    
    

13. Update the Store configuration file (see below).

Update the Store Configuration File

1. Execute the following script to update the Store configuration file with the new file system size:

   /app/scripts/update_store_allocation.sh -l 1

2. Start the application by running app-util.sh and selecting option 1 (start all).